2DA10BC.M adaptor for allowing the fitment of 10 Watt 2D lamps in a regular bayonet lampholder. Housed within the adaptor is a magnetic ballast and electronic starter unit.

The adaptor features a GR10q lampholder.

These adaptors were marketed as energy-saving alternatives to 60 Watt filament lamps, particularly in table lamps, although they worked equally as well in pendant fittings.